[SystemOut]

From my limited vantage point (in-laws) this is normal in the Filipino culture. My wife and I moved away from her parents so we didn't do this but her sister's kids were probably a 70/30 split in being at the grandparents' house. Her cousin's kids were the same. In fact, many of them would send the kids to the Philippines for months at a time where the grandparents lived to be raised by them. It felt really odd to me at first but that's more because it wasn't how I was raised plus I didn't have any grandparents that were still alive when I grew up.